I find it likely that someone who realised that if they were to touch that paper fortune the Bitcoin price will totally crater would have made additional billions they could actually access by mining more bitcoin at a point where the difficulty was still ridiculously low.
The value of the bitcoins in those early wallets isn't real, because they are the most watched bitcoin wallets in existence, and any movement there would send shockwaves through the crypto space.
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From a financial standpoint, this makes no sense.
First, they could just liquidate all their other BTC before moving the Satoshi coins.
Second, even with a significant price impact, the net worth of an additional 1M BTC would surely outweigh any realistic price slippage.
Third, the price probably wouldn't even crash that much. We're talking about a 5% increase in supply... which rationally, should result in a ~5% dip in price. I know the market would overreact, but I doubt it would be by much more than say 20%.